Method of making rubber hose.



P.V J. GLEASON. METHOD 0F MAKING RUBBER HOSE.

APPLIOATION FILED JAN. 29, 1908.

935,254 z Patented sepa-28,1909.

' ivrrim saaras rafraivr manica FREDERICK J GLEASON, OF WALPOLE, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ALVI 'I'. BALDWIN, OF BUFFALO, NEW YORK.

METHOD OF All/Ll-tKlIlhTGr RUBBER' HOSE.

ascesa.

To uit whom it may concern:

le it lr'nown that l, Fnnnninoii JWGLEA- sox, of lValpole, in the county of Norfolk and .State of h/lassachusetts, have invented certain new andV useful lmproifements in Methods of Making Rubber Hose, of which the following is a speciiication.

This invention has relation to the manufacture of vulcanized rubber hose such as that used for conveying liquids or fluids.

Ou the accompanying drawings, l have illustrated one way in which the method may be practiced.-

Figure l represents a hose pipe in process of construction. Fig. 2 illustrates a vulcanized pipe and shows how the core or mandrel may be \\'ithdrawn. Fig. 3 represents a section through the molds with the core or mandrel Eind hose thereon.

Considerable dilliculty has heretofore been experienced in the manufacture of vulcany ized rubber hose in withdrawing. the core or mandrel from the interior of the hose.

According to my invention, the hose is formed about a mandrel which is, in whole'` or in part, formed of some suitable material whichfuses or melts at a temperature lower than that destructive to rubber. After vulcanization, the core, which is melted, mayl be easily withdrawn without the necessity of expanding the hose or otherwise stretching it.

The core or mandrel is illustrated as consisting of a cylinder a which is illust-rated as a tube, and which is made of cast iron or other material which does not fuse except at av high temperature. About this cylinder is molded a sheath or layer a of the fusible material. These two portions u a constitute the core or mandrel about Which the hose is constructed. l generally prefer'to Aplace about the core a layer b of rubber which may be green or which may have been previously vulcanized. About this layer are wrapped as many layers of rubber, canvas or the like as may be desired, these layers or wrappings being indicated at b. Around them is placed an exterior layer b2 which will preferably be of rubber. The core with the various layers thereon, which constitute p Specification of Letters Patent. gtilgigmlgd Sptg., 2S, lllltll. Application led January 29, 1908. Serial No. l$13,278.

the hose, is placed between molds c c as shown in Fig. 3, and is subjected to heat and pressure sullicient to eil'ect the vulcanizing of the hose. The ends of the molds are preferably closed.

The fusible material, as stated, is of such nature that it melts at a temperature lower than that destructive to rubber. I preferably employ lead, tin and bismuth which, accordingr to their proportions, may. be caused to melt at a low temperature, say from 199O upward. An alloy of iive parts by weight of bismuth, three parts by weight of tin and tivo parts by weight of lead serves excellently for the purpose desired.

since it melts at approximately 199o 1.02010 Fahrenheit and may be me ted by inserting it in boiling water so that, if by any chance, particles of the core remain in the hose, they may be removed by inserting it in a vat of boiling water. This alloy melts without ebullition and without giving off gases so as to cause an expansion within the tube. 'ilhea-ulcanizing temperature, to which the hose is subjected, is sufficient to melt the sheath or layer a of the core or mandrel so that, after the hose has been removed kfrom the molds, the molten material may bepermitted to flow out from its end, as shown in Fig. 2, to permit the easy removal of the inner portion a of the core.

The core is initially rigid so that it will vsustain and maintain in place the layers which constitute the hose.

I claim The herein described method of making vulcanized rubber hose which consists in forming a tubular structure of vulcanizable material about a mandrel or core having an external sheath of a metallic alloy fusible below a temperature destructive to the article, vulcanizing the tube thus formed, melt-- ing the-fusible sheath, and withdrawing the said mandrel or core.

In testimony whereof I have affixed my signature, in presence of two Witnesses.

FREDERICK J. GLEASON.

Witnesses:

P. W. PEZZETrI, A. L. FoLsoM. 

